Spray gun



Oct.. 19, 1937. i c. R. IRWIN 250964,042" I SPRAY GUN Filed July 14, 1936 ...u l I Z5- J i 30 W" INVENToR, Y 2 /FF/e E. [la w/N.

A TTORNEY Patented ct.y 19, 1937 1: SPRAY GUN y `(")liilo'd Rillrwin, Losv Angeles, Calif. .*Ap'pliatiqn July 14, 1936, serial-Nq. `90,531'- somms. (c1. 28s-22,) a'

This 'invention 'relates to improvements l in spray-,guns of the class shown and described inmy prior `patent application filed' October 28.1935,- Serial No.47,07v9. I Y 1 i Theobject ofI my present 'invention is to provide simple and practicable Vconnective devices between the screw-cap arranged to connect theapparatus with the neck of a bottle or can' and the tubular barrel wherein the force-pump elements of the apparatus are contained, said connective devices forming a rigid and secure point at such most vulnerable portion of the apparatus and serving to compress the extremity of said tubular barrel as protection against the same cracking and lengthwise splitting of the tube-end.

A further object of the invention is the provisionof the novel methodof connection between a tubular barrel and a plug iitting the end thereof through the agency of a collar having an voutwardly flaring an'ge' guiding and inwardly crimping the terminal edgeof the barrel under pressure into an annular `groove in said plug, and incidentally rigidly securing therewith such accessory devices, such as a screw-cap. A.

Other objects and advantages residing in my invention, and objects relating to details of construction and method will be apparent in the course of item detailed description to follow and nally pointed out in the appended claims.

The accompanying drawing illustrates by Way of example a representative form of my invention and the method by which the same is made, in which:

Figure 1 is a view in side elevation of a spraygun made in accordance with my invention, shown partly in vertical section.

Fig. 2 is a detached view in vertical section on an enlarged scale of the plug-element of the invention.

Fig. 3 is a collective view of the flaring-flanged ring, in section, together with the end of the tubular barrel adapted to enter therein.

Fig. 4 is a similar view of the disassembled elements of the invention shown in prospective.

Fig. 5 is a fragmentary. detached view of the tubular barrel, illustrative of the contacted end thereof after the connectingoperations have been performed.

Referring to said views, thereference numeral I indicates a tubular barrel provided at its lower end with a check-valve, indicated by broken lines 2, and containing a coil-spring 3 engaging said check-valve at its lower end and having its tapered upper endfitting within an inverted cup-plunger 5. A tubular rod 6 is connected to said plunger and extends through the upper end of the barrel vwhere it terminates in a head-block 1 having an L-sliaped i passage therethrough and communicating with a laterally disposed nipple' 8 to'which the spraynozzle I0 is connected. f A

' ',Ihe upper end of said rbarrel is closed by a `cylindrical plug II pressed therein, said'plug having an axially arranged bore through whichthe rod` 6 is slidable longitudinally in a close fit, inldentations being formed on theopposite sidje'sof ,1 0 the-rodto provide corresponding bulges`I2v to limit the upward travel ofA therod through interference at the lower extremity of said bore. i

vThe body I3 of said plug is adapted to enter said barrel lin a close sliding nt thereabove an annular groove I4 is formed between said body and au laterally directed flange I5 extending 'concentrically somewhat beyond the periphery of the body. i `l v The inner wall I6` of said annulargroove is de- 20 sirablyvertical and at right angles to its upper wall I1.' Thelower wall of Isaidgroove, however, is partially beveled, as seen at I8- in Fig. 2, or wholly inclined, as indicated at 20'1n Fig. 1, with` respect to the inner wall I'6. 25

2l indicates an annular collar having a laterally directed ange 22 whose central opening is of dimensions to admit of the passage of vthe plugbody I3 therethrough. Said collar extends downwardly and outwardly in a flaring flange 23 where- 30 in the inclination of its inner surface,A 24 is substantially similar tothe bevel I8 or wall 20 of the groove I4, the diameter of the lower end of the flange 23 being slightly greater than the external diameter of the barrel I. 35

A circular metal screw-cap 25 is formed with a central aperture 26 in itsy top 21 of dimensions `to admit the passage of the body I3 of the plug I I therethrough as far as the flange 22 which overlies the top. The cap is provided with a centrally apertured gasket 29 to provide a leak-tight joint with the screw-threaded neck of a can or bottle 28 when threaded thereon by means of screw-threads 30 formed in said cap. y 45 The method of forming the joint between the plug II and barrel I and to reliably secure the screw-cap 25 thereto may be described as follows: With the collar 2I positioned within the screwcap 25 and having their central apertures in regis- 50 ter the plug-body I3 is thrust upwardly therethrough so that the top 21 of the cap is in contact with the ange I5 and the flange 22 of the collar lies upon its inner side. The collar is thus in juxtaposition with relation to the groove*y I4.' the 55 Y A 'andV diremy 15 n contactwitli the lilax'ix'ig-ang'e2310i the collar*` which serves as a vdie to force and contract said A rim inwardlyin a. crimp between'y said llanto" and the bevel I8 or inclined wall 2l.' as thecaee With said parts thus arranged in inverted position upon a fiat, stable surface, not shown. the

barrell with the rod C andconnected parts;v with f the exception 'of the headblock 1, ispresented f thereto, the rod beingslipped through the bore of said plug.` Pressure is theny applied to the oppositerend to` press the barrel upon the body I3 and'to bring the rim :il of the lbarrel.'.into

may be, the space' between thev flange Il land "said beveled or inclined wall being restricted so that a relatively severe frictionalunion is established between the collar and the plug-body through the i'nterposition oi said barrel-rim effecting `a rigid support for the screw-cap through thecontact of the collar flange 22 and bearing upon the kplug-ange I5, a

The material best adapted vfor the formation of the barrel I is brass although in its connecw .tionwiththe plug bythe usualpressed ntfas seen in myv prior application; the wallof; the

barrel -1s` necessarily somewhat expanded :andi v v e e and the beveled wallof UIOOve.

withthe side strains encountered ,in its-use, cracks are apt to develop thereinabout its connection withthe plugwith consequent loosening of-its hold and separation of the desired rigid connection with .the screw-cap. e Y

' Inthe present invention, the inward deflection of t'nerim causes a rcontraction and thickening oi' the kmaterial" thereat further reinforced by the bearing ofthebiiange 23 thereon which pre-5. cludes the formation of` cracksin the barrel-end.

It will be evident that the :structure and method herein described and shown is applicable to other devices and purposes than that exempliiied and that such other applications with reasonable `groove adjacent thereto,A the' vcal t plug ghaving to enter the fend modidcatlons and as lo forming apart of this invention as shallfairly fall within the scope of thefamended claims.'k

Having descrid nry inventiongewhat claim.

` Ina ay tubular a en plus having momenten ce emu-che miV j of saidv barrel and a peripheral ilange atf itl: per end.s'aid withan vdiamant said plug-body and o formed with an outwardly flaring danze by the rim lof said barrel whereby saidrim beeontracd mw mdfmove when is, pressed upon 'thegplulfbody l lov'verfwaliY of said grooverbeing. beveled. @screw-cap apertured to' exzendabout ,saidrplug andfbearluvon mier-` ingupon theundersideofsaidfcapandafiarlng which the end of vsaidplug iefreceivedandlfex tracted rigid relation betweensaid Y 3. Infa spray-gun,A atubular barrel. 'a of said barreland, a 'peripheral flange at its upper KVend, lsind plus being formed with anmannum groove adjacent said. ange,'the'lowerfwall of seov y side of said ilang'eracollar having ka. danze tending .Bt its extremity inta said l groovehjin 4sind groove bemg-beve1ed.andewusr Yabout said plus-body` formed 'with' s narmgnance 1 nas ycuneo similarly to tnebeveieawaiiof said'sroover saidi'iaring -iiangebeingof diameter to receive Y the rim ofsaid barrel andadapted to contract e vsind rim into'said groove upon the4 barrel being pressed upon said plug-flaming` 

